Red azo dye.



i To all whom it may concern 'bluislrred coloration and yielding upon reman srnans uma ,nmunrcn aonnsu ann WILHBL urnmvznrnn, ,or rnvnnkusnn, GERMANY,-

HArIou orNEW'YoRK.

1,098,388; 15% D in Be it known that we, HEINRICH Jordan and lVILnnLM NEELMEIER, doctors of philosophy, chemists, citizens 'of the German Empire, residing at Leverkusen, near Cologne, Germany, have invented new" and useful Improvements in New Red Azo Dyes, of which the following is a specification.

We have found that new and valuable azo dyestuffs can be obtained by combining the diazo compounds prepared from-para aminohenzoylpara-aminosalicylic acid'com pounds, such as para-aminobenzoyl-para amino-salicylic acid, para-aminobenzoylpara-amino-sulfo s'alicylic acid, para-amino-hcnzoyl-para-amino-chloro-salicylic acid, para amino henzoyl para-amino-cresotinic acids, etc, with acidyl-Z-amino-5-naphthol- 7-sulf0nic acids, such as 2-acetylamino-5- naphthol7-sulfonic acid, 2-benzoylamino-5- naphthol -7 -sulfonic acid, paraaminobenzoyl-2-amino-5-naphthol-7-sulfonic acid or other acidyl compounds, such as phthaloxyh; nitrohenzoyl-, meta-aminobenzoyl-, aminobenzoyl-aminobenzoyl-derivatives.

The new dyes are after being dried and pulverized in the shape of their alkaline salts dark red powders soluble in water generally with an orange to red coloration and in concentrated sulfuric acid with a red to duction with acetic acid and Zinc powder It dyes cotton clear yellowish-red shades fast to light. It can be diazot-ized on fiber (the sulfonic grou being split oil from the NH group) and dieveloped with beta-naphthol by which treatment the shades turn bluer and fast to washing. The dye obtained from para-aminobenz0y1-2.5.7-aminonaphthol sulfonic acid has similar prop erties.

" Specification of was :Ea tent.

. flp plication'f leri zru yaz, rare. I Serial no; 789,4 59.

Assignees" mo srnrnnriormnurs col,- mc; orlunw YORK, N. n, A CORPO- Fatented June 2;, 1914;,

a para amino-henzoyl para ami'nosalicylic acid compound and a 2-acidylamino-5-naphthol-6-amino-7-sulfonic acid. They dye cotton cl r red shades fast to light.

in o er to lliliSiPft'tc the new process more fully the following example is given, the parts being by weight:286 partsof para aminobenzoyl-para-arnino-ortho-cresotinic acidare dissolved in 10000 parts of water and 53 parts of soda, reprecipitated- 'wlth' 300 parts of hydrochloric acid (19% diaz'otized with 69 parts-ofsodiuin ni'trite in 100 parts of Water at 2025- C.

The diazo compound thus obtained is then stirred into a cold solution of 482 parts of the disodium salt of para-sulfaminobenzoyl :2-amzno-5-naphthol Z-sulfonic acid containmg 120 parts of soda. l/Vhen the combinatlon 18 complete the mixture of the reaction is acidulated and the dyestufi is salted out and filtered 05%. It is after being dried and pulverized in the shape of its sodium salt a dark red powder soluble in water with a yellowislrred coloration and in concentrated sulfuric acid with a red-blue coloration; and yielding upon reduction with zinc powder and acetic acid para aminobenzoyl -paraamino ortho cresotinic acid and para sulfaminobenzoyl-2-amino-5-naphthol-6-amino- 7-sulfonic acid. It has in a free state most probably the formula: 0

We claim 2- 1. The new azo dyestufis derived from a (hazo compound of a para-aminobenzoylpara-aminosal'icylic acid compound and 'an acldyl derivative of 2-amino-5-napl1thol-7- sulfonic acid and being after being dried and pulverized in the shape of their alkaline salts dark powders soluble in water generally with an orange to red coloration which is after being dried and pulverized 2 coon in the shape of its sodium salt a dark red powder soluble in water with a yellowishred coloration and in concentrated sulfuric acid with a red-blue coloration; yielding upon reduction with acetic acid and zinc powder para aminobenzoyl-para-amino-ortho-cresotinic acid and para-sulfaminobenzoyl 2-an1in0-5-naphthol-6-amino-7-sulfonio acid; furnishing when dyed on the cotton fiber clear yellowish-red shades fast to light which can be diazotized on fiber and develnishing on cotton fiber clear red shades fast to light and to soap, substantially as described.

2. The new azo dyestufi having in a free state most probably the formula:

oped with beta-naphthol, shades fast to washing being thus obtained, substantially as described.

In testimony whereof we have hereunto set our hands in the presence of two subscribing Witnesses.

HEINRICH J ORDAN.- [1 8.] WILHELM NEELMEIER. [L. 8.] v

Witnesses HELEN NUFER, ALBERT NUFER. 

